They are all Liars and a Thief.

Bjorn - Lied about sending RSS to SH4 which doesn't exist

Ivar - Lied about studying "Heimdallsr Horn" in the Arms Guildk which doesn't exist

Ragnar - Lied about his Elder earned victory point by crafting standard pieces of equipment in forge.

Einar - Lied saying last battle win because hero used the bronze brooch, which is not a combat type

Loki - Lied about banishing many moon wolves to get storm runes.  Storm is Range and is not from Moon Wolves.  Moon Wolves are Melee.

They ALL stole Scald crummy weapon which he probably made more than 1 anyways.

So knowing that Scald is the one telling the story and putting it together.  

Scald is the thief because he lied four times telling the story wrong.

Thanks